Industry experts are now expecting Ennis to secure more promotions following her success at the Olympics and her general commercial appeal.

"For Jess Ennis, being the poster girl for the Games, she has obviously secured a lot of sponsorship agreements in advance - probably around Â£1m to Â£1.25m," brandRapport's Nigel Currie told Marketing Magazine.

"However, her victory will potentially earn her around Â£3m per annum over the next two to three years in the run-up to Rio.

"Because of the number of medals Britain has won, there will be even more competition for the lucrative marketing contracts but Ennis has clearly emerged as the big star."